<?php

/**
 * Provides rendering logic for the NextGen Basic ImageBrowser
 */
class A_NextGen_Basic_ImageBrowser_Controller extends Mixin_NextGen_Basic_Gallery_Controller
{
	/**
	 * Renders the front-end display for the imagebrowser display type
     *
	 * @param C_Displayed_Gallery $displayed_gallery
	 * @param bool $return
	 * @return string
	 */
	function index_action($displayed_gallery, $return = FALSE)
	{
		$picture_list = array();

		foreach ($displayed_gallery->get_included_entities() as $image) {
			$picture_list[$image->{$image->id_field}] = $image;
		}

		if ($picture_list)
        {
            $retval = $this->render_image_browser($displayed_gallery, $picture_list);

			if ($return)
            {
                return $retval;
            }
			else {
                echo $retval;
            }
		}
		else {
			return $this->object->render_partial('photocrati-nextgen_gallery_display#no_images_found', array(), $return);
        }

	}

    /**
     * Returns the rendered template of an image browser display
     *
     * @param C_Displayed_Gallery
     * @param array $picture_list
     * @return string Rendered HTML (probably)
     */
    function render_image_browser($displayed_gallery, $picture_list)
    {
        $display_settings = $displayed_gallery->display_settings;
        $storage     = $this->object->get_registry()->get_utility('I_Gallery_Storage');
        $imap        = $this->object->get_registry()->get_utility('I_Image_Mapper');
        $application = $this->object->get_registry()->get_utility('I_Router')->get_routed_app();

        // the pid may be a slug so we must track it & the slug target's database id
        $pid = $this->object->param('pid');
        $numeric_pid = NULL;

        // makes the upcoming which-image-am-I loop easier
        $picture_array = array();
        foreach ($picture_list as $picture) {
            $picture_array[] = $picture->{$imap->get_primary_key_column()};
        }

        // Determine which image in the list we need to display
        if (!empty($pid))
        {
            if (is_numeric($pid))
            {
                $numeric_pid = intval($pid);
            }
            else {
                // in the case it's a slug we need to search for the pid
                foreach ($picture_list as $key => $picture) {
                    if ($picture->image_slug == $pid)
                    {
                        $numeric_pid = $key;
                        break;
                    }
                }
            }
        }
        else {
            reset($picture_array);
            $numeric_pid = current($picture_array);
        }

        // get ids to the next and previous images
        $total = count($picture_array);
        $key = array_search($numeric_pid, $picture_array);
        if (!$key)
        {
            $numeric_pid = reset($picture_array);
            $key = key($picture_array);
        }

        // for "viewing image #13 of $total"
        $picture_list_pos = $key + 1;

        // our image to display
        $picture = new C_Image_Wrapper($imap->find($numeric_pid), $displayed_gallery, TRUE);
        $picture = apply_filters('ngg_image_object', $picture, $numeric_pid);

        // determine URI to the next & previous images
        $back_pid = ($key >= 1) ? $picture_array[$key - 1] : end($picture_array);

        // 'show' is set when using the imagebrowser as an alternate view to a thumbnail or slideshow
        // for which the basic-gallery module will rewrite the show parameter into existence as long as 'image'
        // is set. We remove 'show' here so navigation appears fluid.
        $prev_image_link = $this->object->set_param_for(
            $application->get_routed_url(TRUE),
            'pid',
            $picture_list[$back_pid]->image_slug
        );
        $prev_image_link = trailingslashit($this->object->remove_param_for($prev_image_link, 'show', $displayed_gallery->id()));

        $next_pid = ($key < ($total - 1)) ? $picture_array[$key + 1] : reset($picture_array);
        $next_image_link = $this->object->set_param_for(
            $application->get_routed_url(TRUE),
            'pid',
            $picture_list[$next_pid]->image_slug
        );
        $next_image_link = trailingslashit($this->object->remove_param_for($next_image_link, 'show', $displayed_gallery->id()));

        // css class
        $anchor = 'ngg-imagebrowser-' . $displayed_gallery->id() . '-' . (get_the_ID() == false ? 0 : get_the_ID());

        // try to read EXIF data, but fallback to the db presets
        $meta = new C_NextGen_Metadata($picture);
        $meta->sanitize();
        $meta_results = array(
            'exif' => $meta->get_EXIF(),
            'iptc' => $meta->get_IPTC(),
            'xmp'  => $meta->get_XMP(),
            'db'   => $meta->get_saved_meta()
        );
        $meta_results['exif'] = ($meta_results['exif'] == false) ? $meta_results['db'] : $meta_results['exif'];

        if (!empty($display_settings['template']))
        {
            $this->object->add_mixin('Mixin_NextGen_Basic_Templates');
            $picture->href_link = $picture->get_href_link();
            $picture->previous_image_link = $prev_image_link;
            $picture->previous_pid = $back_pid;
            $picture->next_image_link = $next_image_link;
            $picture->next_pid = $next_pid;
            $picture->number = $picture_list_pos;
            $picture->total = $total;
            $picture->anchor = $anchor;
            
            return $this->object->legacy_render(
                $display_settings['template'],
                array(
                    'image' => $picture,
                    'meta'  => $meta,
                    'exif'  => $meta_results['exif'],
                    'iptc'  => $meta_results['iptc'],
                    'xmp'   => $meta_results['xmp'],
                    'db'    => $meta_results['db']
                ),
                TRUE,
                'imagebrowser'
            );
        }
        else {
            $params = $display_settings;
            $params['anchor']       = $anchor;
            $params['image']        = $picture;
            $params['storage']      = &$storage;
            $params['previous_pid'] = $back_pid;
            $params['next_pid']     = $next_pid;
            $params['number']       = $picture_list_pos;
            $params['total']        = $total;

            $params['previous_image_link'] = $prev_image_link;
            $params['next_image_link']     = $next_image_link;
            $params['effect_code']         = $this->object->get_effect_code($displayed_gallery);
                
            $params = $this->object->prepare_display_parameters($displayed_gallery, $params);

            return $this->object->render_partial(
                'photocrati-nextgen_basic_imagebrowser#nextgen_basic_imagebrowser',
                $params,
                TRUE
            );
        }
    }

    /**
     * Enqueues all static resources required by this display type
     *
     * @param C_Displayed_Gallery $displayed_gallery
     */
    function enqueue_frontend_resources($displayed_gallery)
    {
		$this->call_parent('enqueue_frontend_resources', $displayed_gallery);

		wp_enqueue_style(
            'nextgen_basic_imagebrowser_style',
            $this->get_static_url('photocrati-nextgen_basic_imagebrowser#style.css')
        );

		$this->enqueue_ngg_styles();
    }
}
